When highlight all and set text font size, both in-place editing mode and text box show the same font size, before Origin2021b, in-place editing mode updated but if select the text box, the font size in Tool Toolbar keeps its original value.
Add text object like AAAA, set the font size of first two A as 30, set the font size of last two A as 30
Open the Text Object dialog
==> Old syntax shows \p136